One of the most famous quotes of Abu Zur`a Al-Razi in regards to the Rafidha Shia:

‘If you see a man belittling anyone from the Companions of the Messenger of Allaah -sallAllaahu alayhi wa sallam- then know that he is a Zindeeq (heretic). That is because we believe that the Messenger -sallAllaahu alayhi wa sallam- is true, the Qur’aan is true and those who conveyed this Qur’aan and the Sunnahto us were the Companions of the Messenger of Allaah -sallAllaahu alayhi wa sallam. Rather what the heretics want to do is criticise our trustworthy narrators so they can nullify the Book and the Sunnah, they are more deserving of being criticised since they are the Zanaadiqa (heretics).’ (Narrated by al-Khateeb al-Bagdadi in ‘al-Kafayah Fee Ilm ar-Rawayah’p.67)